Q. A clinical trial is run to investigate the effectiveness of an experimental d
ID: 3277765 • Letter: Q
Question
Q. A clinical trial is run to investigate the effectiveness of an experimental drug in reducing preterm delivery to a drug considered standard care and to placebo. Pregnant women are enrolled and randomly assigned to receive either the experimental drug, the standard drug or placebo. Women are followed through delivery and classified as delivering preterm (< 37 weeks) or not. The data are shown below.
Preterm Delivery
Experimental Drug
Standard Drug
Placebo
Yes
17
23
35
No
83
77
65
Using this data, generate a 95% confidence interval for the difference in proportions of women delivering preterm in the experimental and standard drug treatment groups.
A. (-0.26, 0.02) OR (-0.02, 0.26)
B. (-0.18, 0.09) OR (-0.09, 0.18)
C. (-O.17, 0.05) 0R (-0.05. 0.18)
D. (-0.15. 0.10) 0R (-0.10, 0.15)
Q. A study is run comparing HDL cholesterol levels between men who exercise regularly and those who do not. The data are shown below.
Regular Exercise
N
Mean
Std Dev
Yes
35
48.5
12.5
No
120
56.9
11.9
Generate a 95% confidence interval for the difference in mean HDL levels between men who exercise regularly and those who do not. Once you have calculated your answer, choose the most appropriate answer from below.
A- (-13.55, -4.55) OR (4.55, 13.55)
B- (-13.6, -3.74) 0R (3.74. 13.06)
C- (-12.45, -3.25) OR (3.25. 12.45)
D- (-13.31, -3.01 OR (3.01, 13.31)
Q- The following data were collected in a clinical trial to compare a new drug to a placebo for its effectiveness in lowering total serum cholesterol. Generate a 95% confidence interval for the proportion of all patients with total cholesterol < 200.
New Drug
(n=75)
Placebo
(n=75)
Total Sample
(n=150)
Mean (SD) Total Serum Cholesterol
185.0 (24.5)
204.3 (21.8)
194.7 (23.2)
% Patients with Total Cholesterol < 200
78.0%
65.0%
71.5%
A-(0.56. 0.65)
B-(0.70, 0.85)
C-(0.54, 0.82)
D-(0.64, 0.79)
Q-A clinical trial is run to evaluate the effectiveness of a new drug to prevent preterm delivery. A total of n=250 pregnant women agree to participate and are randomly assigned to receive either the new drug or a placebo and followed through the course of pregnancy. Among 125 women receiving the new drug, 24 deliver preterm and among 125 women receiving the placebo, 38 deliver preterm. Construct a 95% confidence interval for the difference in proportions of women who deliver preterm.
A- (0.35, 0.07) OR (0.07, 0.35)
B- (-0.11, 0.09, (-0.09, 0.11)
C- (-0.22, -0.006) OR (0.006, 0.22)
D- (-0.43, 0.21) OR (-0.21, 0.43)
QEUSTION -What is the best type of graph to display the following data?
Gender
Cigarettes per day
Female
45
Male
20
Female
30
Female
40
Male
90
Male
50
Male
20
Male
23
Female
9
A-BOXPLOT B-SCATTERPLOT C- SIDE BY SIDE BOXPLOT D- BAR GRAPH.
Q-What is the best type of graph to display the following data?
Region of country: New England,New England,South,West,New England, Mid-Atlantic,Mid-Atlantic,New England,New England,South,New England,New England,Midwest,New England,Mid-Atlantic,Mid-Atlantic,New England,West
A- BOXPLOT B- SCATTERPLOT C- SIDE BY SIDE BOXPLOT D- BAR GRAPH,
Q-What is the best type of graph to display the following data?
Duration of hospital stay: 5, 10, 6, 11, 5, 14, 30, 11, 17, 3, 9, 3
A- SCATTERPLOT. B- SIDE BY SIDE BOXPLOT C- BAR GHRAPH D-BOXPLOT
Q-The following table shows the distribution of BMI in children living in US and European urban neighborhoods. (The data are in millions.)
Neighborhood
Normal Weight
Overweight
Obese
US
125
50
40
Europe
101
42
21
What proportion of children is obese and live in a US urban neighborhood?
A- 0.11 B- 0.16 C- 0.19 D- 0.22
Q-The following table shows the numbers of patients classified as underweight, normal weight, overweight and obese according to their diabetes status.
Underweight
Normal Weight
Overweight
Obese
Diabetes
8
34
65
43
No Diabetes
12
85
93
40
What proportion of normal weight patients is not diabetic?
A- 0.22. B- 0.28. C-0.36. D- 0.71
Q-The following table shows the numbers of patients classified as nderweight, normal weight, overweight and obese according to their diabetes status.
Underweight
Normal Weight
Overweight
Obese
Diabetes
8
34
65
43
No Diabetes
12
85
93
40
What proportion of diabetics is obese?
A- 0.11. B-0.17. C-.22 D-.29
Explanation / Answer
We are allowed to do 1 question at a time. Post again for second question.
Q:
Q-The following table shows the distribution of BMI in children living in US and European urban neighborhoods. (The data are in millions.)
Neighborhood
Normal Weight
Overweight
Obese
US
125
50
40
Europe
101
42
21
What proportion of children is obese and live in a US urban neighborhood?
Answer: Total people in US urban = 215 million
Number of obese children in US urban neighborhood = 40 million
Probability that a child picked up at random is obese
= 40 million / 215 million = 0.19
Q: a part) The following table shows the numbers of patients classified as underweight, normal weight, overweight and obese according to their diabetes status.
Underweight
Normal Weight
Overweight
Obese
Diabetes
8
34
65
43
No Diabetes
12
85
93
40
What proportion of normal weight patients is not diabetic?
Ans: Number of normal weight = 119 and number of normal weight which are not diabetic = 85
Hence the probability = 85/119 = 0.714(approximately)
B part) Ans: Number of diabetics observations = 150 and number of obese and diabetic observation = 43
Hence the probability = 43/150 = 0.2866 or 0.29
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